Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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Does anyone know if Elastico support cross-shard transactions?

I came across this interesting paper on how to shard a blockchain with providing a solution named Elastico. But, I can't find how it is handling cross-shard transactions. Does anyone know how it is ...
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Looking for feedback on (Browser-based) Blockchain Simulator

I have created a Blockchain 'simulator' in JavaScript, for the purpose of helping explain how the technology works. It is complementary to a website I have set up years ago, where I attempt to explain ...
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2answers
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How could I make my own API to query the blockchain

I'm looking to access transaction history for some specific coins directly from the blockchain. The main reason is that most of current API are not free or don't provide information for the coins I ...
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How to add new btc block to blockchain [duplicate]

Please let me known that "How I add a new BTC block to blockchain?" as a sole miner.
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1answer
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generating random pair key has standard?

If a crypto wallet generates all pair key between small range for example between 1-100, the risk and possibility of creating the same key is an increase. Generating random pair keys for ...
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I have two different crypto wallets with all of the same “receive” addresses. How can I fix this? [closed]

I use Trust Wallet and Crypto.com DeFi Wallet. I wanted a particular coin in my DeFi Wallet. I copy the Receive address from DeFi Wallet, paste it in my transfer, and the coin goes to Trust Wallet ...
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In case of private data collections how can the nodes that don't have complete access to the transactions know about the world state? [closed]

Hyperledger Fabric offers the ability to create private data collections, which allow a defined subset of organizations on a channel the ability to endorse, commit, or query private data without ...
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1answer
27 views

How is the Max Target of a Genesis Block Decided?

I've been diving into the world of Blockchain and crypto lately, trying to build my understanding of mining specifically. I understand that in POW systems, the difficulty of the first block is 1, and ...
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1answer
27 views

Bitcoin was sent to my wallet 7 days ago but it has not reflect in the wallet [duplicate]

I checked the bitcoin explorer to check if the bitcoin is in and Yes it is but it stays unspent but it has not reflect in the wallet of the main address for 7days now ...
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Do some crypto-assets have an “admin key” that allow some users to exercise “unilateral control and influence” over the asset? [closed]

I am reading the SEC prospectus Coinbase's initial public offering, available here. On page 20, it is written: Many crypto assets have concentrated ownership or an “admin key”, allowing a small group ...
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Does anyone know the Dibi-ex platform? [closed]

After buying cryptocurrency via services like Binance, there are other services that trade such cryptocurrency. One of those sites is dibi-ex.com. I would like to know whether or not this platform is ...
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How are other tokens “minted” on the Bitcoin blockchain? [closed]

Since NFTs are being discussed a lot lately, I got curious about HOMERPEPE and how it's actually constructed. It turns out that it was "minted" on the Bitcoin blockchain, and I'm confused ...
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How do I backtrack an ETH wallet? [closed]

I had some ETH deposited into my account from a wallet. However, ALL the ETH was supposed to be deposited and I am not sure it was. When I click on the "from" link, that wallet shows that it ...
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1answer
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Why don't bitcoin nodes invalidate new blockchains that don't contain all the data of the old blockchain?

If nodes only accepted new valid blockchains that contained all the data of the old blockchain, then miners will still be able to add blocks to the current blockchain because their blockchain will ...
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Compare private keys and public keys from blockchain

What I want to do is to compare all generated private keys and public keys from blockchain: Input data: I have gigabytes of strings (one per line) which I can convert to BTC private keys and later ...
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How to make new BEP-20 token which is synchronizing with BEP-2 token? [closed]

Someone, please help me. I've deployed BEP-20 token, and I'm gonna make it to synchronize with existing bep-2 token. But I don't know how to do that.
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1answer
40 views

I can not find a clear mathematical proof method with details and example for “near to zero chance of generating the same pair key wallet”

A mathematical proof method with details for "near to zero chance of generating the same pair key wallet" I can not find a clear mathematical proof for the top sentence with example
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Does the protocol ensure that pair keys wallet are unique? [duplicate]

What mechanism for proof unique pair keys (public key and private key) when creating a wallet with several sources(such as "wallet.btc.com", "wallet.bitcoin.com", "www....
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bitcoin-etl: problems with installing

I am trying to install bitcoin-etl: https://github.com/blockchain-etl/bitcoin-etl to analyze bitcoin blockchain. I have Mac OS and python3, I run this in terminal: pip install bitcoin-etl Also tried ...
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1answer
37 views

Adroid Blockchain wallet ver 4.0.12 recovery

Just repaired my old Android phone, with Blockchain wallet version 4.0.12. It is asking for either the four digit PIN or the password, which I have both forgotten. Is there any way to recover this now ...
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1answer
57 views

Why aren't public-private keys sufficient to build a block chain? Why do we need proof of work/stake?

Taking the simple case of Bitcoin here: If all nodes can validate published transactions by checking the signature (created using the private key of the sender) of the transaction against the public ...
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4answers
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If the computer that stores the bitcoin is destroyed, how does someone access their bitcoin?

I have seen people say that you just need the private key and "some software" to recover your bitcoin. What does this actually mean in the real world? Can someone give an example? Also, if ...
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2answers
200 views

Blockchain transaction verification

I watched the 3Blue1Brown video about the blockchain and a question arose. How is it ever guaranteed that if I send out a broadcast it will ever be put in a block that gets verified. For example it (...
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1answer
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Possible To --enable-wallet After Syncronization With Blockahin?

I am running bitcoind from the command line (--without-gui) and my system apparently does not have the correct Berkley DB version (4.8+). Therefore, I chose to run the program without the wallet ...
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1answer
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Preventing secretly mined chains

In order to prevent attackers from secretly mining chains (which they could later publish to perform double-spending attacks), would it be possible to require some information to be included in the ...
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Sent money from Bitcoin Core to mobile Electrum and for 3 days can`t recieve it

3 days ago I made transaction from my Bitcoin Core to my mobile Electrum but I didn't receive any money yet. I can't see this transaction in Electrum and on Blockain,Tradeblock either, however, ...
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RegTest Genesis Error

how to generate regression test genesis block ? i saw in bitcion nonce is 2. but i generate from GenesisH0 it not showed nonce 2. for other altcoin i saw nonce is 0 why ? how to generate it ? python ...
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3answers
327 views

How does the blockchain resolve arbitration issues?

I understand that a bitcoin wallet is nothing but a transaction record performed on the block chain. How are transaction details updated in the decentralised block chain? In a centralised system a ...
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1answer
105 views

What's the advantages of using the block chain as opposed to L2 solutions

I'm looking for a good example and explanation from a software architecture perspective BUT for general audience about the benefits of solving and having blockchain features on Layer 1 not ...
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1answer
31 views

How to split fee between more than one miners?

I found that some BTC blocks have more than one miners, for instance: https://www.blockchain.com/btc/block/000000000000000049a0914d83df36982c77ac1f65ade6a52bdced2ce312aba9 there are two miners: ['...
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1answer
431 views

Blocks from before the genesis block

How do we know that there are no blocks that predate the genesis block? A block that could potentially contain any number of coins. If somebody already created such a block from before the genesis but ...
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bitcoin-cli sendmany but not shown explorer

I sent bitcoin to 93 people with sendmany function. It made a tx id = "abc7f3f878fe0fff59bd295ea1a7f86c4a13f1ea8bbd3eb52629f040d06069b4" but I couldn't show in bitcoin explorer. I ran ...
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1answer
77 views

Can a unconfirmed transaction be lost or modified?

I am beginner and I am still learning fundamentals of block and bitcoin network. Suppose, I do a transaction on bitcoin network, it is marked as unconfirmed transaction and is stored in mempool of ...
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Computation expenses of syncing / getting a full node up and running, hardware considerations

Since a full node needs to process the entire block chain from the beginning and it keeps getting bigger this requires more computing resources over time. Does it seem more likely in the near future ...
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1answer
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Trying to understand the mempool and how transactions are picked

I am very new to blockchain and try to understand it completely. What I think I understood is, that every transaction is going to the mempool first and these transactions are getting picked by miners. ...
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Final Balance -Balance showing different then Coinspot BTC wallet

Bit of a beginner question I have been using crypto wallets for a few months and have basically learned through trial and error. The question is my BTC wallet on Coinspot has a $0 and 0.0 BTC balance. ...
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2answers
45 views

What prevent someone to not use the receiver address of one transaction as the sender in another one?

Title may be confusing you, and to be honest I am also confused how things work and I am new to this crypto world so sorry in advance if I am not using the correct words. I try to explain : Let say ...
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28 views

Unconfirmed tx with blockchain [duplicate]

It’s been a month now and my tx still is unconfirmed. I know it’s because of my low tx fee. I tried using Viabtc and paid them a fee of $117.00 and nothing happened. I’m still stuck waiting not ...
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0answers
8 views

Unconfirmed Transaction is stuck from last three days [duplicate]

https://blockstream.info/tx/8504d29348a9bb33e0b4c73538f5dd04464bfe11d45445e55e1524102a656d23 This transaction is stuck from last three days. Need help pls
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1answer
65 views

Bitcoin cash not syncing the current block [closed]

I have installed BCH "Bitcoin Unlimited Cash Edition bucash1.7.0.0". Problem is the current block is not synced in our wallet server, the server is stuck at block "635258". How to ...
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1answer
46 views

Does the concept of a blockchain introduce a violation of privacy?

Per my understanding, in a blockchain system, all transactions are recorded on an immutable ledger. Given this, if you know your friend's public address, wouldn't it be possible to figure out the ...
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I cannot locate which bit coin wallet my funds have gone to

I sent bit coin from 2 external accounts to the same bit coin wallet which were completed on the 4th March 2021. My problem is that I do not know which wallets they have gone to. I cannot find these ...
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1answer
24 views

Classifying Miners based on their Location

Is there any way to classify the bitcoin miners based on their geographical locations? Is there any possibility of doing so for the participants in cooperative mining as well? Thank you
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I can withdraw my BTC on cryptoayo and they insisting on me to pay an amount …?? How can one unlock block chain and be independent and withdraw? [duplicate]

Hello guys ...Im asking how can I withdraw from cryptoayo and there is a block chain that doesn't wanna release my current balance and it's 23,825 been trading on auto trading for six months
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32 views

Where did my Bitcoin go? Please help!

Can someone please help me understand what happened here? Did I get hacked? Or is this sitting in an exchange or wallet somewhere that I can’t figure out. Can someone help me figure out what exchange ...
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1answer
109 views

To be blunt bought bitcoin in 2009 at 25 cents have not touched it

I am hoping you can help I read through a few of you answers to other inquiries and as per my research you are very well versersed. I acquired Bitcoin back when it first came out of trading at 0.0008 ...
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1answer
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What happens if everyone disconnected from the blockchain

What would happen if for some reason, every computer connected to the blockchain was disconnected, and no peer-to-peer connection was established with the blockchain protocol between 2 users. Would ...
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53 views

My Bitcoin was transferred to someone’s address from my blockchain wallet!

Ok I have done research on my situation and this is what I have found. On 1/17/2021 I tried to login to my blockchain wallet and the captcha was glitching. It asked like 10 times! So I sent blockchain ...
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1answer
25 views

Unable to view coinbase transactions on blockchain.com

I'm trying to view some of the transactions I've made on coinbase on blockchain.com. I copied my btc wallet address from coinbase and searched it on blockchain.com -- nothing showed up. Why is this ...
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1answer
306 views

transferring funds from bittrex to binance

I want transfer a btc from bittrex to binance but they are telling me that they are supporting only non segwit adress. I don’t know if my btc adress In binance it’s non segwit too. Thank u

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